Control valve



FIG. 1 is a top, rear, left side perspective view of a control valve, showing our new design;

FIG. 2 is a top plan thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a bottom plan thereof; and,

FIG. 7 is a rear elevational thereof. 

The ornamental design for a control valve, as shown and described. 